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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b69985f63e24585bee20c7d3d1f2cb0deacaf15d9f8be9ee5c45afd16b928d3d' 
  AND token = 'o4qj8puQIltvj7sZbsJaW5ds7dnltfuuku9XeTp1aL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}